Buy calendars! I always wait until after the first of the new year and then
buy beautiful colored print calendars featuring the art work of different
famous artists. You get 12 prints per calendar and can usually buy them at
year-end clearance prices for around $3. The prints store great in files,
can be laminated, made into posters, etc. Each picture usually has an
informative little blurb about the print and/or the artist.
I also tear pages out of art magazines and save them. :)